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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ced280f1e53388ad4cf6c321a21ae3477de1fc1d813b03da218ea939ed73ea' 
  AND token = 'uPRPo9cRT707B019unBvv3jB2oPE+WLBupctY+Y/8LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}